[Apollo] buildRequestContext (Federation)

buildRequestContext.ts

export function getUserFromToken(token): ITokenUser {
  const cert = readFileSync(join(__dirname, "../../keys/public.pem"));

  if (token) {
    const decoded = jwt.verify(token, cert, { algorithms: ["RS256"] });
    return decoded["user"] as ITokenUser;
  }

  return null;
}

export async function buildRequestContext({ req }): Promise<IContext> {
  let user = null;
  let token = null;

  if (req.headers.authorization) {
    try {
      const matches = req.headers.authorization.match(/Bearer (.+)/);
      token = matches[1];
      user = getUserFromToken(token);
    } catch (error) {
      token = null;
      user = null;
    }
  }

  return {
    user,
    token
  };
}